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An engine is the means by which a moped is powered.

Common engine parts include:

  • An intake for taking in fuel and air, and an exhaust to release the spent mixture.
  • A piston, which moves up and down through the engine's top end, compressing the fuel/air mixture.
  • Some form of ports or valves for controlling the fuel/air mixture and the exhaust.
  • An engine head, which seals the top of the cylinder. This contains the spark plug threads, and, in 4-stroke engines, the valves.
  • A bottom end, where the connecting rod drives the shaft which is connected to the transmission.
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